摘要
以半纤维素水凝胶为基材,化学氧化法原位引发吡咯聚合,制备具有导电性能的半纤维素/聚吡咯复合水凝胶,对其化学结构和微观形貌进行表征,并分析其流变学性能和导电性能。结果表明,半纤维素水凝胶与聚吡咯成功复合,得到的导电水凝胶具有稳定的大孔结构,吸水能力强,平衡溶胀度为420%;弹性较高,表现出典型的固体本质属性和一定的假塑性流体性质;具有良好的电学性能,直流电导率达5.6×10^-3 S/cm,其交流阻抗具有明显的频率依赖性。
The hemicellulose hydrogel was used as the matrix to adsorb pyrrole monomer which undergoes in situ polymerization by chemical oxidation to form polypyrrole to produce the composite hydrogel with conductive properties.The chemical structure and microstructure were characterized and observed by using Fourier transform infrared spectroscopy,scanning electron microscope.The rheological properties under low shear frequency were measured by the rotary rheometer.The electrical properties were tested by four-probe tester and electrochemical workstation.It was found that the polypyrrole was successfully combined with hemicellulose hydrogel,and the resulting conductive hydrogel had a stable macroporous structure with strong water absorption capacity,with equilibrium swelling degree up to 420%.The prepared hydrogel shows high elasticity,exhibiting typical solid nature properties and certain pseudoplastic fluid properties.In addition,the composite hydrogels display good electrical properties.Its direct current conductivity reached 5.6×10^-3 S/cm,and the alternating current impedance had obvious frequency dependence.
作者
张旭
孙辉
樊保民
杨彪
ZHANG Xu;SUN Hui;FAN Bao-min;YANG Biao(School of Materials Science and Mechanical Engineering,Beijing Technology and Business University,Beijing 100048,China)
出处
《食品与机械》
北大核心
2020年第6期75-79,165,共6页
Food and Machinery
基金
国家自然科学基金(编号:31570575,21606005)
北京市自然科学基金项目(编号:2192016)
北京市属高校青年拔尖人才培育计划项目(编号:CIT&TCD201904042)。
关键词
半纤维素
水凝胶
导电
聚吡咯
hemicellulose
hydrogels
conductive
polypyrrole
